clear
clc

I = imread('boy.bmp');

Ileft = I(:, 1:80);
Imiddle = I(:, 81:160);
Iright = I(:, 161:240);

IleftCS = imadjust(Ileft);
IrightHE = histeq(Iright);

I2 = [IleftCS Imiddle IrightHE];

subplot(1,2,1), imshow(I,[0 255]), title('Original low contrast')
subplot(1,2,2), imshow(I2,[0 255]), title('After contrast improvement')